...meaning they are not static, but are actuated by a certain event...

Safety Interlock Switches, Non-contact (40 companies) Non-contact safety interlock switches couple a moveable guard door with the power source of the hazard ...
process-equipment.globalspec.com/Industrial-Directory/drill_rig_safety_sensor - 84k - Cached - Similar pages
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Schmersal Inc. - Product Announcements | Product NewsSchmersal standard safety limit switches are designed for use with moveable machine guards/access gates which must be closed for operator safety & for any ...
www.globalspec.com/Supplier/ProductAnnouncements/Schmersal - 62k - Cached - Similar pages

Product Announcements - Search ResultsThe Series BNS33S coded-magnet sensor is designed for use as a safety interlock switch on movable machine guards/articulating robot arms. ...
www.globalspec.com/.../SearchResults?criteria=Safety Sensor... - 36k - Cached - Similar pages
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Correct use The safety switch series T2008 & T2011 interlock movable safety guards without guard locking, thus ensuring that ...
www.sti.com/ltr2/access.php?file=pdf/7037.pdf